# MIDIWriter vs MF

The clearest difference is review sentiment: MF at 50% against MIDIWriter's 0%. MF also leads on rating (4.6 vs 1.5) and update cadence (monthly vs every 35 months). MIDIWriter's advantage is price ($0.99 vs $14.99). On ads, in-app purchases, monetization model and device support there is nothing between them.

MIDIWriter costs $0.99 and MF $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

MF holds the better App Store score, 4.6 against 1.5. Both are backed by a comparable volume of ratings — 2 and 9 respectively. Written reviews point the same way: 0% of MIDIWriter's written reviews are positive against 50% of MF's.

MIDIWriter ships an update every 35 months, MF monthly. The most recent releases landed on November 1, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | MIDIWriter | MF |
| --- | --- | --- |
| Price | **$0.99** | $14.99 |
| Rating | [1.5 (2 ratings)](https://appshunter.io/ios/app/midiwriter/id520751563/reviews) | **[4.6 (9 ratings)](https://appshunter.io/ios/app/mf-101s-lowpass-filter/id6449946747/reviews)** |
| Number of ratings | 2 | **9** |
| Positive reviews | 0.0% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 35 months | **Monthly** |
| Monetization | Paid | Paid |
| Size | 31 MB | 47 MB |
| Requires iOS | 16.0 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Masayuki Akamatsu](https://appshunter.io/developer/284722836) | [Moog Music Inc.](https://appshunter.io/developer/396776421) |

## What reviewers say

### MIDIWriter

[App page](https://appshunter.io/ios/app/midiwriter/id520751563)

This app transforms keyboard input into musical notes and sounds. Type characters to instantly generate MIDI messages, or input phrases to create musical sequences with adjustable tempo and looping. It includes a built-in sound engine and supports external MIDI devices and apps.

**Highlights:** Text to MIDI conversion, Built-in General MIDI sound engine, Phrase playback with tempo control, Drum mode with multiple kits, External MIDI output, Hardware keyboard support, Wi-Fi MIDI networking

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### MF

[App page](https://appshunter.io/ios/app/mf-101s-lowpass-filter/id6449946747)

This app is a digital recreation of a classic analog lowpass filter effect pedal. It allows users to add dynamic motion and warm, vibrant tones to various audio sources like guitars, vocals, and synthesizers.

**Highlights:** Analog 4-pole lowpass filter emulation, Envelope follower for dynamic motion, Processes guitar, voice, and synths, AUv3 effects plugin, Warm and vibrant sound quality

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is MIDIWriter free?

MIDIWriter costs $0.99, with no in-app purchases.

### Is MF free?

MF costs $14.99, with no in-app purchases.

### Which has better reviews, MIDIWriter or MF?

MF is rated higher. MIDIWriter averages 1.5 out of 5 from 2 ratings, while MF averages 4.6 from 9 ratings.

### Do MIDIWriter or MF have ads?

Neither MIDIWriter nor MF shows ads.

### Which is updated more often, MIDIWriter or MF?

MIDIWriter ships an update every 35 months, and MF monthly. Most recently, MIDIWriter was updated on November 1, 2026 and MF on November 7, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*